Buchanan L S
Dental Education Laboratories, 1515 State Street, Suite 16, Santa Barbara, CA 93101, USA.
Int Endod J. 2001 Mar;34(2):157-64. doi: 10.1046/j.1365-2591.2001.00387.x.
To describe the GT file shaping steps required to create apical resistance in the presence of a wide root apex.
Canals are occasionally encountered with apices wider than 0.25 mm. These can be some of the most difficult to manage with conventional instruments, and overfills are common. Shaping such canals with GT files requires a paradigm shift of thinking, extending tapered files through the apex to create linear resistance in the apical few mm of the canal. GT standard and accessory files allow canals with apices up to around 0.7 mm to be prepared for tapered gutta percha cone-fit. Apices larger than this should be considered too large for further shaping, and repaired with MTA before filling.
Tapered apical preparations offer optimal resistance form for obturation. Tapered apical preparations can be prepared in most roots with wide apices by extending GT files and GT accessory files to or through the apex. Apices wider than 0.7 mm should be repaired with MTA prior to filling.
描述在存在宽根根尖的情况下创建根尖阻力所需的GT锉塑形步骤。
偶尔会遇到根尖宽度超过0.25mm的根管。使用传统器械处理这些根管可能是最困难的，超充很常见。使用GT锉对这类根管进行塑形需要思维模式的转变，将锥形锉延伸至根尖以外，在根管根尖几毫米处创建线性阻力。GT标准锉和辅助锉可用于预备根尖直径达0.7mm左右的根管，以适配锥形牙胶尖。直径大于此的根尖应视为过大，无法进一步塑形，在充填前用MTA进行修补。
锥形根尖预备为根管充填提供了最佳的阻力形态。通过将GT锉和GT辅助锉延伸至根尖或穿过根尖，大多数宽根尖的根管都可以进行锥形根尖预备。直径大于0.7mm的根尖在充填前应用MTA进行修补。
